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<p>Polybenzoxazine (PBz) aerogels are promising candidates for high-performance thermal insulation due to their lightweight nature and excellent thermal stability. However, the preparation of non-green solvents and their non-hydrophobic nature result in poor thermal insulation properties during application, which seriously hinders the development of PBz aerogels. Herein, we report a green, one-pot strategy to fabricate a novel polybenzoxazine-based (BPBz/SiO<sub>2</sub>) hybrid aerogels with inherent hydrophobicity by incorporating boric acid and methyltrimethoxysilane. The prepared aerogels exhibit low density (0.144&#xa0;g·cm<sup>−3</sup>), low thermal conductivity (0.0355 W·m<sup>−1</sup>·K<sup>−1</sup>), and excellent fire resistance. Remarkably, the BPBz/SiO<sub>2</sub> hybrid aerogels exhibit outstanding intrinsic hydrophobicity (a water contact angle of 144°) and effectively prevent the adhesion of contaminants on the surface. This work is expected to play a significant role in advancing green synthesis technologies, innovating aerogel structural design, and developing high-performance thermal insulation materials.</p> Graphical Abstract <p></p>

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One-pot green synthesis of polybenzoxazine-based aerogels for intrinsically hydrophobic thermal insulation

  • 期刊论文

  • 发表日期：

    2025年9月3日

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  • Zeyu Li,
  • Jinlong Zhou,
  • Yihan Liu,
  • Sujing Yang,
  • Junhui Huang,
  • Jiajing Xu,
  • Guihua Tang,
  • Yunyun Xiao

摘要

Polybenzoxazine (PBz) aerogels are promising candidates for high-performance thermal insulation due to their lightweight nature and excellent thermal stability. However, the preparation of non-green solvents and their non-hydrophobic nature result in poor thermal insulation properties during application, which seriously hinders the development of PBz aerogels. Herein, we report a green, one-pot strategy to fabricate a novel polybenzoxazine-based (BPBz/SiO2) hybrid aerogels with inherent hydrophobicity by incorporating boric acid and methyltrimethoxysilane. The prepared aerogels exhibit low density (0.144 g·cm−3), low thermal conductivity (0.0355 W·m−1·K−1), and excellent fire resistance. Remarkably, the BPBz/SiO2 hybrid aerogels exhibit outstanding intrinsic hydrophobicity (a water contact angle of 144°) and effectively prevent the adhesion of contaminants on the surface. This work is expected to play a significant role in advancing green synthesis technologies, innovating aerogel structural design, and developing high-performance thermal insulation materials.

Graphical Abstract